Its like saying naruto will be stronger than the first!!!
That's an inferior comparison. The first hokage was powerful because he was 1) A senju with amazing chakra 2) Was extremely intelligent and was able to use his natural abilities which made him EXTREMELY formidable.
Naruto doesn't have his intellect and his power is drawn SOLELY from the tailed beasts(and the sage mode). The Shodaime was an amazing ninja who brought order to the ninja world ,while Naruto is an inferior ninja who spams Rasengan in every situation.
Sasuke is a genius warrior. Currently he has become ruthless enough to summon Susanoo, and his Susanoo is darker than than Itachi's(and maybe even Madara's) he also has EMS, something only Madara has had. These things combined, along with his INTENSE hatred, have lead many to believe he could equal, or surpass, Madara. However, we have to know Madara's "limit" to understand how Sasuke would go beyond it. The only thing beyond exceptional is perfect.